BUY EE-SX671 https://www.utsource.net/itm/p/11727776.html

Description: The EE-SX671 is a miniature photointerrupter from Omron. It is a reflective-type photointerrupter that uses an infrared LED and an NPN phototransistor. Features: Compact size High sensitivity Long sensing distance High-speed response High isolation voltage Low power consumption Applications: Position sensing Speed sensing Counting Paper feed control Printer control Automated equipment control (For reference only)